Advanced Graphics Programming Using Open GL by Tom McREYNOLDS

By Tom McREYNOLDS

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The BRDF represents the amount of light (in inverse steradians) that is scattered in each outgoing angle, for each incoming angle. The emissive term models the emission of light from an object in cases where the object itself acts as a light source. An example is an object that fluoresces. In OpenGL, emission is a property of the object being shaded and does not depend on any light source. Since neither the emissive or ambient terms are dependent on the location of the light source, they don’t use a gating function the way the diffuse and specular terms do (note that the diffuse term gates itself).

7 Transform concatenation order. 8 Perspective and parallel projections. 7 Projection Transform The projection transform establishes which part of the modeled scene will be visible, and what sort of projection will be applied. 8). The view volume of a parallel projection is parallelepiped (box shape). The viewer position establishes the front and back of the viewing volume by setting the front and back clipping planes. Objects both in front of and behind the viewer will be visible, as long as they are within the view volume.

8), described later in the book. 2 Texture Coordinate Generation The texture coordinate pipeline can generate texture coordinates that are a function of vertex attributes. This functionality, called texture coordinate generation (texgen), is useful for establishing a relationship between geometry and its associated textures. It can also be used to improve an application’s triangle rate performance, since explicit texture coordinates don’t have to be sent with each vertex. The source (x, y, z, w) values can be untransformed vertices (object space), or vertices transformed by the modelview matrix (eye space).

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